Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Patent
1985-01-18
1987-06-23
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
29130, 72214, 148147, B21B 1702, B21B 2102, C21D 938
Patent
active
046743120
ABSTRACT:
Pilgering apparatus for reducing a tube particularly of zirconium alloy. The reduction is effected by grooved annular dies. Each die has a recess in its bore extending between the surfaces on which the die is mounted on the shaft on which it is rotated. Under the pressure applied to reduce the tube, the die is flexed. As a result of the flexing tension exists in the die in the volume near the recess and pressure is developed in the volume near the groove in which the tube is engaged. The pressure counteracts the tension resulting from the tube-reducing pressure. Each die is case hardened in the region of its grooves but not in the region of the recess.
REFERENCES:
patent: 417669 (1889-12-01), Edelen
patent: 3650138 (1972-03-01), Persico
patent: 4112812 (1978-09-01), Wardwell et al.
patent: 4184352 (1980-01-01), Potapov et al.
patent: 4233834 (1980-11-01), Matinlass et al.
Katz Steve
Larson Lowell A.
Westinghouse Electric Corp.
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